Whether you live in a city with street lights that peek in through your windows at night or you need darkness in the daylight hours, you know how hard it can be to shield yourself from the bright world outside. Blackout shades, either paired with blackout curtains or on their own, can solve this problem. Over the years, we chatted up salespeople, interviewed industry experts, and tested 16 shades. These four are the best for darkening any home.